US 12,463,605 B2
Compensation circuit
Zhenfei Peng, Guangzhou (CN); and Qiang Su, Guangzhou (CN)
Assigned to SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou (CN)
Filed by SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou (CN)
Filed on Sep. 2, 2022, as Appl. No. 17/929,677.
Application 17/929,677 is a continuation of application No. PCT/CN2021/136094, filed on Dec. 7, 2021.
Claims priority of application No. 202110402044.7 (CN), filed on Apr. 14, 2021.
Prior Publication US 2023/0006619 A1, Jan. 5, 2023
Int. Cl. H03F 3/21 (2006.01); H03F 1/32 (2006.01)
CPC H03F 3/21 (2013.01) [H03F 1/32 (2013.01); H03F 2200/451 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A compensation circuit, comprising a power amplifier, a current bias circuit, a power detection circuit, and a current control circuit; wherein
the power detection circuit, connected with the power amplifier, is configured to detect a voltage amplitude of a radio frequency input signal of the power amplifier and output a reference current when a voltage amplitude of the radio frequency input signal meets a preset condition;
the current control circuit, connected with the power detection circuit and the current bias circuit, is configured to receive the reference current output by the power detection circuit and output a compensation current to the current bias circuit based on the reference current;
the current bias circuit, connected with the current control circuit and the power amplifier, is configured to receive the compensation current output by the current control circuit and generate a direct-current bias current, and output the compensation current and the direct-current bias current to the power amplifier; and
the power amplifier, connected with the current bias circuit, is configured to receive the compensation current and the direct-current bias current, and amplify a power of the radio frequency input signal based on the compensation current and the direct-current bias current;
wherein the current control circuit comprises a first branch and at least one second branch;
the first branch, connected with an output end of the power detection circuit, is configured to receive the reference current output by the power detection circuit; and
the second branch, connected to the first branch and the current bias circuit, is configured to form a current mirror with the first branch to output the compensation current based on the reference current received by the first branch;
wherein the first branch comprises a first transistor;
a source of the first transistor is connected with a first power supply;
a gate of the first transistor is connected with the second branch, and a drain of the first transistor is shorted with the gate of the first transistor; and
the drain of the first transistor, connected with the output end of the power detection circuit, is configured to receive the reference current output by the power detection circuit.